Lighting calculator
Watt to Lux Calculator
Estimate lux from watts, area, and efficacy.
i Enter W × efficacy as the first field, then divide by area.
Lighting calculator
Watt to Lux Calculator
Instant result
Result
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Enter values to calculate.
How to use
Follow these steps for a clear answer.
Enter the known values
Fill in the fields for your calculation.
Choose a mode if available
Use the tabs when multiple directions are offered.
Read the result
The result updates as you type.
Frequently asked questions
Key distinctions behind the calculation.
How does the Watt to Lux calculation work?
It uses the formula lx = (W × η) ÷ A.